What it is
The Molex 430450427 is the 4-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, board-to-wire header with 0.118" (3.00 mm) pitch and through-hole solder termination. The housing is glass-filled liquid crystal polymer (UL94 V-0), black, with a 0.390" (9.91 mm) insulation height. Contacts are brass, tin-plated on both the mating face and the solder post at 60 µin (1.52 µm) thickness. The dual-row layout spaces the two rows at 0.118" (3.00 mm) row pitch, matching the standard Micro-Fit 3.0 footprint. All four positions are populated. The header uses a locking ramp on the shroud to secure the mating receptacle, and a board guide feature on the housing body that assists alignment during through-hole placement on the production line.
What the ratings mean
The shrouding on all four walls of the housing body means the connector cannot be mis-mated with a different-position-count Micro-Fit 3.0 receptacle — the shroud geometry is consistent within the series, so any Micro-Fit 3.0 plug housing with matching circuit count will mate. The locking ramp on the header body mechanically locks the receptacle's primary latch once inserted, reducing the risk of vibration-induced de-mating in automotive and industrial harness runs.
Where it is used
Micro-Fit 3.0 headers are used as board-to-wire power and signal interconnection points in automotive, industrial, medical, and telecom harness assemblies — the header side mounts to the PCB edge or panel, and the matching plug housing with crimp terminals terminates the wire harness. The 430450427's 4-circuit count suits it for short multi-load branch circuits or sensor/hardware node connections where a larger connector would be oversized.